text: const { NotImplementedError } = require('../extensions/index.js');
  
  /**
   * Given a singly linked list of integers l and an integer k,
   * remove all elements from list l that have a value equal to k.
   *
   * @param {List} l
   * @param {Number} k
   * @return {List}
   *
   * @example
   * For l = [3, 1, 2, 3, 4, 5] and k = 3,
   * the output should be [1, 2, 4, 5]
   *
   * Singly - linked lists are already defined with this interface
   * function ListNode(x) {
   *   this.value = x;
   *   this.next = null;
   * }
   */
  
  
  module.exports = function removeKFromList(l, k) {
      console.log(l);
      console.log(k);
      if (l == null || l.length == 0) return {};
  
      let prev = null;
      let current = l;
      do {
          if (current.value == k && prev == null) {
              current = current.next;
              l.next = null;
              l = current;
          } else if (current.value == k) {
              prev.next = current.next;
              current.next = null;
              current = prev.next;
          } else {
              prev = current;
              current = current.next;
          }
      } while (current != null);
  
      console.log(l);
      return l;
  }